Non-modal analysis of coaxial jets

• Published in: Journal of fluid mechanics Vol. 872; pp. 665 - 696
• Main Authors: Montagnani, D., Auteri, F.
• Format: Journal Article
• Language: English
• Published: Cambridge Cambridge University Press 10.08.2019
• Subjects: Dynamical systems; Dynamics; Experiments; Fluid dynamics; Fluid flow; Fourier analysis; Harmonic analysis; Harmonic response; Inflow; Inlet pipes; Inlets (waterways); Modal analysis; Nonlinear analysis; Nonlinear dynamics; Nonlinear systems; Perturbations; Reynolds number; Turbulence; Velocity; Vortices; White noise

In this work, we investigate the subcritical behaviour of a coaxial jet subject to small-amplitude perturbations at the inflow. We use the results of optimal harmonic analysis and dynamic-mode decomposition (DMD) of the flow fields at a Reynolds number, based on the diameter and maximum velocity of...